At the same time a method of utilizing round swing transition horn is put forward to void shock produced in the process of welding two round pipelines of the same or similar diameter by such experiments and debugging 同时通过附加圆摆动的折线轨迹曲线的实验和调试，确定了利用圆摆动过渡尖角的方法，避免了当焊接两圆管直径相同或是相近时在焊接过程中产生的冲击。
The degree of graphitization and diameter of cnts increased with elevated temperature , which showed that high temperature improved the catalysis of catalyst , and was attributed to uniform arrangement of atomic carbon , and hindered amorphous carbon 随着生长温度的升高，催化剂的活性提高，有利于碳的有序排列，生长的碳纳米管直径增大。氨气对纳米碳管的定向排列影响显著，而氢气、氮气则无影响。
The experimental results show that this type of filter is do a kind of high efficiency and low resistance , which under its nominal air flow rate ( 1000m / h ) and when the diameter of filter tube is 30mm and the length of it is 1 . 1m , its resistance is the lowest , only 50pa 实验结果表明：该种多管式高效空气过滤器确是一种高效低阻的过滤器，其在额定风量下( 1000m ~ 3 h ) ，滤管直径为30mm ，袋长为1 . 1m的过滤器阻力最小，只有50pa 。
Abstract : according to the character and actual condition of rh in shanghai baogang , molten steel flow in ladle and its effect on decarburization were studied with a three dimension turbulent flow and concentration modelling . the results show that , within a certain range , the decarburization rate increases not only with the increase of snorkel diameter and ar fluid flow but also with the decrease of the immersed depth of the snorkel 文摘:根据上海宝钢rh的特点和实际情况，建立了三维流场、浓度场程序，对钢包内钢水的流动、处理过程的脱碳进行了研究，并对它们的影响因素进行了分析.结果表明，在一定范围内增加循环管直径和吹气流量、减小浸渍管浸入深度有助于提高脱碳速度
Analysis of nonlinear finite - element for ultimate strength of 81 overlap tubular k - joints with ansys program is carried out in this dissertation . the influence of nondimensional joints parameters , , and ov on failure mode and ultimate strength of overlap tubular k - joints is studied . simultaneously , 27 tubular gap k - joints are analyzed for comparative purposes 分析时考虑了四个无量纲参数，即支管直径与主管的直径之比；主管的直径与壁厚之比；支管壁厚与主管壁厚之比以及支管搭接率o _ v对搭接节点破坏模式和极限承载力的影响。
It was found that the ultra - fine powder can flow smoothly in a spouted bed with a draft tube under some sorts of design parameter and operating condition , thus a new effective method to improve fluidization quality of the ultra - fine powders is obtained ; at higher supplied gas velocity , an increase in the solid circulation rate is observed ; the extent of the distance between the nozzle and the draft tube inlet result in the promotion of the solid circulation rate ; the solid circulation rate increase with increasing the draft tube diameter or the bed mass ; the gas bypassing is nearly zero in the present work ; and the solid flow in the annulus is observed as a moving bed 结果表明：在一定的床层结构和操作条件下，超细粉可以在导向管喷动床中实现平稳流化，从而为改善超细粉的流化质量提供了一种有效的新方法；固体循环速率与喷动气流量、导向管直径、导向管底部与喷嘴出口间距以及床层装填量成正比；气体则基本上不存在“旁路”现象；环隙区中的颗粒流动表现为一移动床特征。
The conclusions are drawn as following : 1 . regularity of fabrication in aluminum matrix composite ring - shaped performs with large dimensions and effects of parameters were investigated , based on the novel crucible movable spray deposition technology and equipment . the optimal parameters are that the diameter of the delivery tube is 3 . 8mm , spray gas pressure is 0 . 8mpa , spray height is 200mm , and transferring pressure of sic is 0 . 5mpa 通过系统的实验研究得到如下结论: 1 .基于新型的移动坩埚自动化控制喷射沉积环坯制备技术及装置,研究了大尺寸铝基复合材料环坯的制备规律,讨论了喷射沉积工艺参数对沉积坯形成过程的影响,得到了最佳工艺参数:导流管直径d = 3 . 8mm ,雾化气体压力p = 0 . 8mpa ,喷射高度h = 200mm , sic颗粒输送压力p送= 0 . 5mpa 。
The optimal parameters of making high silicon content aluminum alloys is : spray height is 220 - 230mm , spray angle is 30 ? the scanning velocity of atomizer is 30mm / s , the original offset of the substrate is 30mm , rotation velocity of the substrate is 120rpm , spray gas pressure is l . ompa , the diameter of the delivery tube is 3 . 6mm , the drawing velocity of the substrate will be adjusted on - line with a plc on the basis of the spray 通过对多层喷射沉积原理及工艺参数的研究，得出制备al - 22si - 3cu - 1mg合金的最佳工艺参数为：喷射高度为220mm - 230mm ，基底转速为120rpm ，雾化器扫描速度为30mm / s ，基底下降转速依据喷射情况由智能控制器进行实时调整，喷射角度为30 ，初始偏心距为30mm ，导流管直径为3 . 6mm ，雾化气压为1 . 0mpa 。
The definition of stability and repeatability of the laser frequency and factors affecting the stability of laser frequency were analysed . the normal methods used to stabilise frequency and produce double - frequency were explained . after analysing the working conditions and related parameters of the laser device , it was concluded that the laser tube should be put inside an insulating cover and an electric discharge tube with a bigger diameter and length , smaller wall thickness and a higher thermal conductivity coefficient should be chosen 分析了激光频率的稳定性、复现性的定义及影响激光频率稳定的因素；介绍了常见的稳频及产生双频的方法；分析论证了激光器双纵模热稳频的使用条件和有关参数的关系，得到结论是：应将激光管装在保温罩内；选用放电管直径及长度大、壁厚小、材料导热系数大的放电管。
